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Journal Article

Processing Gray Selenium in Phosphonium-Based Ionic Liquids

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Ruck,  Michael
Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Pietsch, T., Blasius, J., Richter, J., Grasser, M. A., Hollóczki, O., Wollmann, P., et al. (2023). Processing Gray Selenium in Phosphonium-Based Ionic Liquids. Inorganic Chemistry, 62(4), 1667-1678. doi:10.1021/acs.inorgchem.2c04094.


Cite as: https://hdl.handle.net/21.11116/0000-000C-A7FF-9
Abstract
The dissolution of gray selenium in tetraalkylphosphonium acetate ionic liquids was investigated by UV-vis, NMR, and Raman spectroscopy as well as quantum chemical calculations and electrochemical methods. Acetate anions and tetraalkylphosphonium cations facilitate the formation and stabilization of oligoselenides Sen2- and cationic Se species in the ionic liquid phase. Chemical exchange of selenium atoms was demonstrated by variable-temperature 77Se NMR experiments. Additionally, uncharged cycloselenium molecules exist at high selenium concentrations. Upon dilution with ethanol, amorphous red selenium precipitates from the solution. Moreover, crystalline Se1-xTex solid solutions precipitate when elemental tellurium is added to the mixture as confirmed by powder X-ray diffraction and Raman spectroscopy. © 2023 American Chemical Society.